EP2465454B1 - Fixation clamp with thumbwheel - Google Patents

Fixation clamp with thumbwheel Download PDF

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Publication number
EP2465454B1
EP2465454B1 EP10194944.4A EP10194944A EP2465454B1 EP 2465454 B1 EP2465454 B1 EP 2465454B1 EP 10194944 A EP10194944 A EP 10194944A EP 2465454 B1 EP2465454 B1 EP 2465454B1
Authority
EP
European Patent Office
Prior art keywords
locking element
fixation clamp
fixation
actuation
actuation element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP10194944.4A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2465454A1 (en
Inventor
Robert Dominik
Klaus Dorawa
Adam Busch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stryker GmbH
Original Assignee
Stryker Trauma SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Stryker Trauma SA filed Critical Stryker Trauma SA
Priority to ES10194944.4T priority Critical patent/ES2541207T3/es
Priority to EP10194944.4A priority patent/EP2465454B1/en
Priority to AU2011253541A priority patent/AU2011253541B2/en
Priority to US13/302,619 priority patent/US8945129B2/en
Priority to JP2011271929A priority patent/JP5918987B2/ja
Priority to CA2761925A priority patent/CA2761925C/en
Priority to CN201110417336.4A priority patent/CN102551853B/zh
Publication of EP2465454A1 publication Critical patent/EP2465454A1/en
Priority to US13/772,876 priority patent/US9050135B2/en
Application granted granted Critical
Publication of EP2465454B1 publication Critical patent/EP2465454B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/60—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like for external osteosynthesis, e.g. distractors, contractors
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/60—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like for external osteosynthesis, e.g. distractors, contractors
    • A61B17/64—Devices extending alongside the bones to be positioned
    • A61B17/6466—Devices extending alongside the bones to be positioned with pin-clamps movable along a solid connecting rod
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/60—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like for external osteosynthesis, e.g. distractors, contractors
    • A61B17/64—Devices extending alongside the bones to be positioned
    • A61B17/6416—Devices extending alongside the bones to be positioned with non-continuous, e.g. hinged, pin-clamp connecting element
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/60—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like for external osteosynthesis, e.g. distractors, contractors
    • A61B17/64—Devices extending alongside the bones to be positioned
    • A61B17/645—Devices extending alongside the bones to be positioned comprising a framework
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/60—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like for external osteosynthesis, e.g. distractors, contractors
    • A61B17/64—Devices extending alongside the bones to be positioned
    • A61B17/6458—Devices extending alongside the bones to be positioned with pin-clamps fixed at ends of connecting element
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/8605—Heads, i.e. proximal ends projecting from bone
    • A61B17/861—Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver
    • A61B17/8615—Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver at the central region of the screw head
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/8875—Screwdrivers, spanners or wrenches
    • A61B17/8877—Screwdrivers, spanners or wrenches characterised by the cross-section of the driver bit
    • A61B17/888—Screwdrivers, spanners or wrenches characterised by the cross-section of the driver bit the driver bit acting on the central region of the screw head
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/0023—Surgical instruments, devices or methods, e.g. tourniquets disposable
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/08—Accessories or related features not otherwise provided for
    • A61B2090/0814—Preventing re-use

Definitions

  • the present invention relates to a fixation clamp and, more particularly, to a fixation clamp for use in an external fixation system for holding bone fragments adjacent to each other.
  • External fixation systems are widely used to connect two or more bone fragments to each other.
  • Such systems comprise bone screws, pins, wires which are inserted directly into the bone material and these systems use external structural elements as fixation rods, bars and rings.
  • fixation clamps are used in order to connect the rods and bars to form a rigid frame.
  • fixation clamps are used in order to connect the rods and bars to form a rigid frame.
  • fixation clamps are used to connect this screws and pins to the rigid frame to specifically hold bone fragments at an intended place.
  • One adjustable fixation clamp is known from EP 0 700 664 comprising two pairs of jaws allowing clamping of a rod as well as of a pin.
  • a clamp for multiple rod-shaped elements is known from EP 1 627 609 having one single pair of jaws.
  • such a clamp allows clamping more than two, e.g. three or four rod-shaped elements as pins with one single clamp, thus reducing the number of clamps.
  • one further fixation clamp is necessary to fix the rod of said clamp to the frame of the fixation system.
  • WO 2007/001945 mentions that usual fixation clamps as e.g. known from EP 0 700 664 allow clamping of one single screw or pin to the frame and that this way to attach pins or rods leads to bulky fixation systems. Therefore WO 2007/001945 discloses a fixation clamp addressing this problem and comprises two pairs of jaws within which each pair of jaws allows the introduction and clamping of two rods or pins etc. at the same time.
  • clamps either provide different diameters of the receptions provided by the jaws to introduce different sizes of rods, pins or wires, or they rely on additional inserts as e.g. disclosed in EP 1 661 523 . Such inserts reduce the diameter of the reception cavities to allow a secure fixing of differently sized rods, pins or wires.
  • WO 01/56486 shows a further bone stabilizing frame system.
  • fixation clamps as known from prior art have the drawback that the user is not able to recognize, if the fixation clamp has been sterilized or if it was already used.
  • fixation clamp which provides an easier clamping process
  • the fixation clamp shall be pre-tensioned manually or hand-operated respectively, and tensioned by means of a tool, such as a wrench.
  • a fixation clamp more particularly for use in an external fixation system for holding bone fragments adjacent to each other with the help of fixation elements, comprising at least one clamping assembly having at least one reception to accommodate a fixation element along the longitudinal axis of the reception and at least one locking element extending through the clamping assembly which locking element provides a clamping force to clamp the fixation element upon tensioning the locking element.
  • the fixation clamp comprises an actuation element which is in connection with the locking element such that the locking element is actuateable by means of the actuation element, and the actuation element is designed such that it is detachable from the locking element after use and that remounting onto the locking element is prevented after having detached the actuation element from the locking element.
  • the locking element By means of actuation element the locking element can be pre-tensioned or pre-tightened. After removal of the actuation element a conventional tool can be use to tighten the locking element firmly. Since the actuation element is provided such that it is not remountable once it has been detached from the locking element, the user is able to separate used or non-used fixation clamps.
  • the actuation element is designed as single-use or disposable element.
  • the actuation element is provided with at least one latching element which engages with the locking element.
  • the actuation element comprises at least two or at least three latching elements which are arranged diagonal with respect to the locking element from each other.
  • the latching elements are arranged such that it is not possible to spread the latching element by means of a tool such as a screwdriver which means that such a configuration the risk that the user remounts the actuation element becomes even smaller.
  • FIG. 1 und 2 show a clamping element or fixation clamp 10.
  • the clamping element 10 consists of a first clamping assembly 20 and a second clamping assembly 30 and a locking element or shaft 40 which is positioned through bores 21, 31 within the two clamp assemblies 20, 30 along the longitudinal axis M of shaft 40.
  • the shaft 40 is preferably a locking element adapted to allow closing the clamp assemblies 20 and 30.
  • Shaft 40 enters a first jaw 11 through a washer 41.
  • the shaft 40 comprises a head portion 44, a reduced diameter portion 43 which is followed by a shaft portion 42 and a thread portion 49.
  • the outer threaded portion 49 is adapted to be screwed into a complementary inner thread within the distal jaw 11 so that turning the head of the shaft 40 changes the longitudinal position of the shaft 40 against the lower jaw 11, which allows opening or closing the entire clamp 10 against the force of a spring 15 provided between the two clamp assemblies 20 and 30.
  • Said spring 15 is preferably positioned in corresponding receptions 16 in the jaws 12. Instead of a spring 15, provided around shaft 40, it is possible to provide a different spring means as Belleville washers or an elastic compressible solid or foam.
  • the end portion of the thread 49 is destroyed through pressure to ensure that the shaft 40 cannot be removed from the clamping assemblies 20, 30 to maintain the clamp as one single piece.
  • Each clamping assembly 20 or 30 comprises two opposing clamping jaws 11 and 12. These jaws 11 and 12 are essentially similarly shaped on the sides facing each other. Each of the jaws 12, 11 comprises a respective contact surface 18, 19 facing the other surface of the jaw 11, 12.
  • the jaw 11 comprises an opening 14 extending into surface 18 and the jaw 12 comprises a pin 13 extending from surface 19.
  • the pin 13 extends into the opening 14. This pin-opening connection prevents therefore a possible rotation between the jaws 11, 12 and a possible misalignment between the jaws 11, 12.
  • the jaws 11 and 12 are provided here with three grooves 51, 52 and 53.
  • Grooves 51, 52 and 53 are all provided in a same plane perpendicular to the longitudinal axis of shaft 40. In that plane they are oriented perpendicular to the radial direction from the center of the bore 21 or 31. As such the grooves 51, 52 and 53 are substantially parallel to outer side wall 61, 62 or 63 of each pair of jaws 11 and 12.
  • the grooves 51, 52 and 53 are each formed as a rounded semi-spherical recess in section to provide receptions 71, 72 and 73 which accommodate cylindrical pins or rods with a defined diameter, if the clamp is closed.
  • the outer side walls 61, 62 or 63 can comprise an inclined sliding surface to allow an easier clipping of such pins or rods 100 into the corresponding reception.
  • the grooves 51, 52, 53 are called to form rounded semi-spherical recesses in a section.
  • each reception 71, 72 or 73 is adapted to accept a different fixation element, i.e. a rod, screw, pin or wire having a different diameter.
  • One preferred first clamping assembly 20 has grooves to accept fixation elements having a diameter of 12 mm, 8 mm and 5 mm, respectively.
  • a different first clamping assembly may have a sequence of diameters of 8 mm, 6 mm and 4 mm, respectively.
  • the second clamping assembly 30 also comprises two jaw portions 11 and 12 and these comprise three grooves 51, 52, 53. These grooves 51, 52, 53 also comprise a sequence of different sizes.
  • the inner jaws portion 12 have an identical structure as have the outer jaws 11, especially in view of the anti-rotation device 55, the reception 16 for a spring 15.
  • the first clamping assembly 20 may comprise a sequence of smaller sizes, e.g. 7 mm, 5 mm and 3 mm; or 6 mm, 5mm and 4 mm; and the second clamping assembly 30 may comprise a sequence of larger sizes, e.g. 13.5 mm, 12 mm and 10 mm. Different sizes are possible, usually for wires starting from 2 mm diameter until thicker rods with a diameter of 30 mm are used within such a clamp 10.
  • Such a clamp 10 allows using one single versatile clamp, wherein the first clamping assembly 20 is used to fix a specific pin or screw or wire having a diameter for which one of the receptions 71, 72 or 73 is adapted. The user takes the clamp 10 and orients the first clamping assembly 20 into the correct alignment so that the pin or screw can be clipped into the corresponding reception.
  • the clamp 10 can be clamped on a rod of an external fixator with the help of the second clamping assembly 30.
  • Said second clamping assembly 30 can be oriented in a way so that the rod can be clipped into the corresponding reception. It is an advantage of the clamp 10 having two clamping assemblies 20 and 30, that a practitioner attaching such a clamp at a bone screw with one clamping assembly 20 and subsequently a rod of an external fixator to the other clamping assembly 30 can check the robustness of his external fixator, and if he finds that the rod he has used is not stiff enough, he simply opens the second clamping assembly 30, removes the thinner rod, turns the second clamping assembly 30 e.g.
  • the second clamping assembly 30 is a traditional clamping assembly or even any other element known in the prior art with clamping elements.
  • the object of a versatile clamping assembly is already achieved through one first clamping assembly 20, since it allows clamping one of three different sizes of screws, pins of wires through simple reorientation of the first clamping assembly 20.
  • Figure 2 shows a cross-section of the clamp according to figure 1 , wherein the clamp 10 is shown in a premounted state, i.e. the spring 15 is under tension.
  • the upper jaw 11 of the first clamping assembly 20 is therefore pushing the washer 41 against a flange 45 of the head of shaft 40.
  • the bore 21 which accommodates part of the shaft portion 42 and the reduced diameter portion 43 is provided with a larger diameter than the respective diameter of the shaft 40 so that an angular or pivoting movement of the first clamping assembly 20 against the shaft 40 is possible. This is in particularly advantageous during the mounting process of the fixation clamp.
  • bore 31 can be provided with a larger diameter than the respective section of the shaft 40 such that jaw 12 of the second clamping assembly becomes pivotable to the shaft 40.
  • the diameter D1, D2 of bore 21 of the first clamping assembly 20 is larger than the diameter of the locking element 40 extending through the bore 21. Thereby a pivoting movement or displacement between the locking element 40 and the first clamping assembly 20 during positioning the clamping assemblies 20, 30 and the pins or rods becomes possible.
  • the bore 21 in the first jaw 11 is a bore 21 having an abutment surface 86.
  • the abutment surface 86 is provided by means a step-like bore 21 having a first section with a first diameter D1 and a second section with a second diameter D2.
  • the first diameter D1 is larger than the second diameter D2.
  • the abutment surface 86 serves as abutment element for the locking element 40 in particular for the flange 45 in case washer 41 is removed.
  • the abutment surface 86 together with the flange 45 prevents that the first clamping assembly 20 will be separated from the second clamping assembly 30 when the washer is removed. Particularly during a cleaning or sterilization process the prevention of such a separation is very advantageous.
  • the bore 21 can be provided with a conical section 32 as shown with bore 21 in the jaw 12 of the first clamping assembly. In the present example there are two conical sections arranged, whereby the diameter of the bore 21 decreases with increasing length of the bore as seen from outside of the jaw 12. In case two conical sections 32 are present the degree of the pivoting motion can be increased.
  • the shaft 40 as part of a locking element is threaded into the lower jaw 11 of the second clamping assembly 30.
  • the lower jaw 11 comprises a threaded opening. Threading may be provided in the bore or the screw may exhibit self-tapping threading.
  • a locking element may be provided which may be a lever locking element or a bayonet lock. Among these locking elements may also be supporting disks or toothed disks, which, for the sake of simplicity, are not shown in the drawings.
  • the two clamp assemblies 20, 30 can be opened and closed through turning the head of shaft 40 and thus turning said shaft 40 in the jaw thread.
  • the locking element 40 extends through the first clamping assembly 20 and is in contact with the second clamping assembly 30 by means of the threaded portion 49.
  • the first clamping assembly 20 In mounting position in which the rods or pins will be positioned in the receptions 71, 72, 73 the first clamping assembly 20 is moveable along the middle axis M of the threaded portion 49.
  • the first clamping assembly 20 Upon actuation of the locking element 40 the first clamping assembly 20 will be moved against the spring pressure towards the second clamping assembly 30 such that the anti-rotation surface 55 of the first clamping assembly 20 comes into contact with the respective anti-rotation surface 55 of the second clamping assembly 30.
  • the locking element 40 Once the locking element 40 is firmly tightened the first clamping assembly 20 and the second clamping assembly 30 are in contact with each other via the anti-rotation surface 55.
  • FIG 2 the mounting position of clamping assemblies 20, 30 is shown. Thereby the clamping assemblies 20, 30 are positioned at the distance to each other with regard to the middle axis M.
  • the second clamping assembly 20 is in contact with the locking element 40 and the spring 15 pushes the first clamping assembly away from the second clamping assembly 20 towards the washer 41 which is contact with the flange 45 of the locking element.
  • the clamping assemblies 20, 30 will be moved due to actuation of the locking element 40 from a mounting position to a locking position and afterwards when fixation shall be cancelled from the locking position to the mounting position. After use the washer 41 will be removed as explained below in order to sterilize the clamping element 10 for further use.
  • Figure 3 shows a view from above on the clamp according to Figures 1 and 2 . Since the clamp of Fig. 1 comprises three grooves 51, 52 and 53, there are three side walls 61, 62 and 63, which provide, when looked from above as in Fig. 2 a triangular shape of each clamping assembly 20 or 30.
  • the clamping element 10 further comprises an actuation element 90 or thumbwheel which is used to prethighten the locking element 40 before it is tightened by means of a tool such as a wrench.
  • an actuation element 90 is shown in figures 4 to 11 , whereby in said figures the fixation clamp according to figure 1 and 3 is shown. For the sake of simplicity not all reference numerals regarding the fixation clamp 10 have been added.
  • Figures 4 to 6 show views of an actuation element 90 to actuate the locking element 40 in order to pretighten the fixation clamp 10 by hand.
  • the actuation element 90 is designed as single use element.
  • the actuation element 90 is mounted onto the locking element 40 during or shortly after the process of sterilizing the fixation clamp 10.
  • the actuation element 90 is removed by the user, e.g. a surgeon or an assistant of the surgeon.
  • the user then is able to tighten the locking element 40 by means of a tool that engages the head portion 44 of the locking element. Since the actuation element 90 is designed as single use element it is not possible to remount the actuation element 90 onto the locking element 40 after having it detached from the locking element 90. This has the advantage the one can easily recognize, if the fixation clamp 10 has already been used or if it is still ready to be used, e.g. if it is still sterilized.
  • the actuation element 90 is designed such that it is mountable by means of a mounting tool 110 onto the locking element 40, that it is detachable from the locking element 40 after use and that remounting onto the locking element 40 is prevented after having detached the actuation element 90 from the locking element 40.
  • the actuation element 90 is provided in mainly three states, namely in a mounting state in which the actuation element 90 is mounted onto the fixation clamp 10, in a mounted state in which the actuation element 90 is fixedly connected with the locking element 40 and in a detached state in which the actuation element 90 is detached from the locking element 10 and in which it is impossible to remount the actuation element 90.
  • the fixation clamp 10 In the mounted state the fixation clamp 10 is ready for use in a surgery.
  • the actuation element 90 comprises in the present embodiment, a cylindrical sidewall 93, a frontwall 95 extending substantially perpendicular to said sidewall 93, a central opening 92 extending along a middle axis M2 substantially parallel to said sidewall 93 and at least one, here four, latching elements 91.
  • the sidewall 93 and the frontwall 95 encompass an interior space 94 in which the latching elements 91 extend.
  • the latching elements 91 extend from the frontwall 95 in direction of middle axis M2 into said interior space 94 and are designed to engage with the locking element 40.
  • the latching elements 91 are provided as elastic or resilient beam elements having a first end 98 which is in contact with the sidewall 93 or the frontwall 95 and a second end 99 which is provided as loose end.
  • the first end 98 is in contact with the frontwall 95 and the first end 98 extends over a first segment 101 substantially parallel to said frontwall 95 and over a second segment 102 substantially perpendicular or angular to said frontwall 95.
  • Said latching elements 91 are by means of a mounting tool 110 elastically deformable from a blocking position in which the locking element 40 is not insertable into the actuation element 90 to a mounting position in which the actuation element 90 is mounteable onto the actuation element 90.
  • the second end or loose end 99 is provided with an engaging element 97 which engages with the locking element 40.
  • the engaging element 99 here has the shape of an embossment extending from the loose end 99 into the interior space 94.
  • the actuation element 90 will be moved along its middle axis M1 with respect to the locking element 40.
  • the locking element 40 enters the interior space from below in figure 6 as indicated by arrow 200.
  • an abutment surface 96 In the vicinity of the second end 99 there is arranged an abutment surface 96.
  • the abutment surface 96 is arranged substantially perpendicular to said middle axis M2 and extends into the central opening 92.
  • the abutment surface 96 blocks the locking element 40 from intruding into the interior space 94.
  • the abutment surface 96 blocks a movement of the locking element 40 into the interior space 94 as it extends into the path of the locking element 40.
  • the latching element 91 in the present embodiment is provided with an optional guiding slot 103 which extends as seen from the central opening 92 or the middle axis M2 into the latching element 91.
  • Said guiding slot 103 serves to accommodate a respective counter part of the mounting tool 110.
  • the actuation element 90 comprises furthermore an outer surface on said cylindrical sidewall which outer surface comprises friction enhancing elements 100 in order to increase friction between a user's hand and the actuation element.
  • the friction enhancing elements 100 are hollow channels extending in direction of the middle axis M2 into said sidewall 93.
  • the sidewall 93 comprises also recesses 104 extending into the sidewall 93.
  • the locking element 40 comprises in its head portion 44 adjacent to flange 45 several recesses 46.
  • the head portion comprises several, here four side surfaces 48 extending from the flange 45 along middle axis M.
  • the head portion 44 ends with a top surface 47 which is arranged substantially perpendicular to the middle axis M and to the side surfaces 48.
  • the top surface 47 here is slightly convex.
  • the side surfaces 48 serve as engaging surface for a tool in order to tighten the locking element 40.
  • the recesses 46 extend into the head portion 44, in particular into the side surfaces 48 of the locking element 40.
  • FIG 7 und 8 in which the actuation element 90 is shown above the fixation clamp 10. Furthermore a mounting tool 110 to mount the actuation element 90 onto the fixation clamp 10 is shown.
  • the mounting tool 110 is used to mount the actuation element 90 onto the locking element 40 during or shortly after sterilizing the fixation clamp 10.
  • the mounting tool 110 mainly serves to push the latching element 91 away from the middle axis M2 so that the clearance between the latching elements 91 becomes larger in order to receive the head portion 44 of the locking element 40. With other words it can also be said that the abutment surfaces 96 will be moved away from the middle axis M2 such that they give way for the head portion 44.
  • the mounting tool 110 comprises a tool section 111 and a handle section 112.
  • the tool section 111 is provided such that the mounting tool 110 can be inserted into the central opening 92 and pushes the latching elements 91 away from the middle axis M2 in order to enlarge the clearance between the latching elements 91.
  • the tool section 111 comprises a respective embossment 113 that is adapted to engage into the guiding slot 103.
  • the handle section 112 is provided such that it can be grasped by a hand of a mounting person.
  • FIG 9 it is shown that the mounting tool 110 will be inserted with the tool section 111 into the central opening 92. This is shown by arrow 201. Thereby the latching elements 91 will be moved away from the middle axis M2. Hence the abutment surfaces 96 as well as the engaging elements 97 will be moved away from the middle axis M2 towards the sidewall 93.
  • Figure 10 shows the actuation element 90 in the mounting state in which the actuation element 90 will be moved towards the fixation clamp 10 in direction of arrow 202, wherein the head portion 44 of the locking element 40 extends into the interior space 94 between the latching elements 91.
  • the latching element 91 is thereby in contact with the side surface 48 of the locking element 40 and therefore it is possible to move the actuation element 90 with respect to the locking element 40.
  • Figure 11 shows the end position of the actuation element 90 with regard to the locking element 40.
  • the actuation element 90 is in a position in which the engaging elements 97 are able to engage into the recesses 46 of the locking element 40.
  • the resilient latching elements 91 will move to their originating position and engage into the recesses 46. In this state the fixation clamp 10 is ready to be used by a user in a operating theatre during a surgery.
  • the actuation element 90 is detachable from the locking element 10.
  • the recesses 46 comprise chamfered edges 460 which are inclined towards the middle axis M1 such that the latching elements 91 will be moved away from the middle axis M2 upon a displacement of the actuation element 90 relative to the recess 46.
  • the latching elements 91 are in contact with the side surfaces 48 of the locking element 40 and slide on said surface.
  • the user has to apply a force in direction of arrow 203 as shown in figure 11 .
  • the latching elements 91 will move back to their origin position due to the resilient structure.
  • the abutment surfaces 96 are arranged such that the locking element 40 abuts with its top surface 47 on the abutment surfaces 96. Hence it is not possible to remount the actuation element 90.
  • the actuation element 90 is preferably made out of plastic material, in particular out of a thermoplast.
  • the actuation element 90 has the following advantages: First of all it is possible to pretighten the fixation clamp 10 by hand without the aid of an additional tool. Furthermore the user is able to recognize, if the fixation clamp is ready for use when the actuation element 90 is still mounted or, if the fixation clamp has been used in which case the actuation element 90 is removed. Furthermore false use is prevented due to the fact that the actuation element 90 cannot be remounted without the aid of a respective tool.

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Surgery (AREA)
  • Biomedical Technology (AREA)
  • Engineering & Computer Science (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)
EP10194944.4A 2010-12-14 2010-12-14 Fixation clamp with thumbwheel Active EP2465454B1 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
ES10194944.4T ES2541207T3 (es) 2010-12-14 2010-12-14 Pinza de fijación con rueda selectora
EP10194944.4A EP2465454B1 (en) 2010-12-14 2010-12-14 Fixation clamp with thumbwheel
AU2011253541A AU2011253541B2 (en) 2010-12-14 2011-11-21 Fixation clamp with thumbwheel
US13/302,619 US8945129B2 (en) 2010-12-14 2011-11-22 Fixation clamp with thumbwheel
JP2011271929A JP5918987B2 (ja) 2010-12-14 2011-12-13 サムホイール付き固定クランプ
CA2761925A CA2761925C (en) 2010-12-14 2011-12-13 Fixation clamp with thumbwheel
CN201110417336.4A CN102551853B (zh) 2010-12-14 2011-12-14 带有指轮的固定夹
US13/772,876 US9050135B2 (en) 2010-12-14 2013-02-21 Fixation clamp with thumbwheel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10194944.4A EP2465454B1 (en) 2010-12-14 2010-12-14 Fixation clamp with thumbwheel

Publications (2)

Publication Number Publication Date
EP2465454A1 EP2465454A1 (en) 2012-06-20
EP2465454B1 true EP2465454B1 (en) 2015-04-08

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EP10194944.4A Active EP2465454B1 (en) 2010-12-14 2010-12-14 Fixation clamp with thumbwheel

Country Status (7)

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US (2) US8945129B2 (zh)
EP (1) EP2465454B1 (zh)
JP (1) JP5918987B2 (zh)
CN (1) CN102551853B (zh)
AU (1) AU2011253541B2 (zh)
CA (1) CA2761925C (zh)
ES (1) ES2541207T3 (zh)

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Also Published As

Publication number Publication date
CN102551853A (zh) 2012-07-11
US9050135B2 (en) 2015-06-09
JP5918987B2 (ja) 2016-05-18
JP2012125577A (ja) 2012-07-05
ES2541207T3 (es) 2015-07-16
CN102551853B (zh) 2015-04-22
CA2761925A1 (en) 2012-06-14
AU2011253541B2 (en) 2016-04-14
US20120150182A1 (en) 2012-06-14
US20130165932A1 (en) 2013-06-27
EP2465454A1 (en) 2012-06-20
CA2761925C (en) 2018-02-20
US8945129B2 (en) 2015-02-03
AU2011253541A1 (en) 2012-06-28

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